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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bce46bc26768d6dfe6911733929c909e266e410ee8f3ddeb8cf06f3e5e5662e' 
  AND token = 'Lt5/9kbjCthLZtzPXN/utoaKH1WhSkPCBS/utVu8weE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}